Question: Who was the chief executive officer of Einsatzgruppen who began work in the year 1939?
Paraphrase: Give me the name of the chief executive officer of Einsatzgruppen who began work in the year 1939?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q152543 p:P169 ?s . ?s ps:P169 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1939')) }